Trunk leans back to swing the arm up
Erectors generate the movement; anterior delt underloaded.
Overactive muscles
Erector spinaeUpper trapezius
Corrective work
Foam RollUpper traps↗StretchLevator scapulae stretch↗Erectors generate the movement; anterior delt underloaded.
Reduces the lever arm; bicep assists; anterior delt loses the load.